Merlin Gerin

Mge Ups Systems

Gérard Rojat

Antoine Kevorkian

Pascal Venet

Karim Abdennadher

Claude Raulet

Christophe Rosset

A method and device for predicting defects of a capacitor, the method including determining the ripple voltage (Udc), the temperature (TP), and the current (Ic) of the capacitor, determining the value of an equivalent series resistance (ESR) of the capacitor, and the capacitance value (C) of the capacitor using a digital filter, determining information representative of the state of aging of the capacitor according to the temperature of the capacitor, and displaying that information and information representative of the value of the capacitance (C) and/or information representative of a cause associated with the state of aging according to the capacitance value. The device may include a converter and an uninterruptible power supply.

Method and device for predicting electrolytic capacitor defects, converter and uninterruptible power supply equipped with such a device

The medium voltage static switch is formed by serial connection of power semi-conductors, preferably of MOS type, controlled by a capacitive line. A diode is connected in parallel with the capacitor of the capacitive line between the gates of two adjacent semi-conductors. The control voltage is applied to a single control input, between the gate and source of the first stage semi-conductor.

Medium voltage static switch

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Chaponost, France

Gérard Rojat